647507513 has 2 divisors, whose sum is σ = 647507514. Its totient is φ = 647507512.

The previous prime is 647507503. The next prime is 647507521. The reversal of 647507513 is 315705746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 350737984 + 296769529 = 18728^2 + 17227^2 .

It is a cyclic number.

It is not a de Polignac number, because 647507513 - 2⁸ = 647507257 is a prime.

It is not a weakly prime, because it can be changed into another prime (647507503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323753756 + 323753757.

It is an arithmetic number, because the mean of its divisors is an integer number (323753757).

Almost surely, 2^647507513 is an apocalyptic number.

It is an amenable number.

647507513 is a deficient number, since it is larger than the sum of its proper divisors (1).

647507513 is an equidigital number, since it uses as much as digits as its factorization.

647507513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 88200, while the sum is 38.

The square root of 647507513 is about 25446.1689257931. The cubic root of 647507513 is about 865.1304615725.

The spelling of 647507513 in words is "six hundred forty-seven million, five hundred seven thousand, five hundred thirteen".